Spatial-temporal characteristics of the transient flow field around high-speed trains transiting the subgrade-cutting transition section under crosswinds

Wei-Chao Yang; Lun Zhao; E Deng; Yi-Qing Ni; Wen Zhao; Yi-Kang Liu; De-Hui Ouyang

Alexandria Engineering Journal (Jan 2024)

Spatial-temporal characteristics of the transient flow field around high-speed trains transiting the subgrade-cutting transition section under crosswinds

Wei-Chao Yang,
Lun Zhao,
E Deng,
Yi-Qing Ni,
Wen Zhao,
Yi-Kang Liu,
De-Hui Ouyang

Affiliations

Wei-Chao Yang: School of Civil Engineering, Central South University, Changsha, Hunan 410075, China; National Engineering Research Center of High-speed Railway Construction Technology, Central South University, Changsha, Hunan 410075, China
Lun Zhao: School of Civil Engineering, Central South University, Changsha, Hunan 410075, China
E Deng: National Rail Transit Electrification and Automation Engineering Technology Research Center (Hong Kong Branch), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom 999077, Hong Kong, China; Corresponding author at: National Rail Transit Electrification and Automation Engineering Technology Research Center (Hong Kong Branch), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Yi-Qing Ni: National Rail Transit Electrification and Automation Engineering Technology Research Center (Hong Kong Branch), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom 999077, Hong Kong, China
Wen Zhao: School of Civil Engineering, Central South University, Changsha, Hunan 410075, China
Yi-Kang Liu: School of Civil Engineering, Central South University, Changsha, Hunan 410075, China
De-Hui Ouyang: School of Civil Engineering, Central South University, Changsha, Hunan 410075, China

Journal volume & issue: Vol. 86
pp. 34 – 48

Abstract

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High-speed trains (HSTs) transiting subgrade-cutting transition sections in crosswinds have become a common operating scenario. This paper utilizes the Improved Delayed Detached Eddy Simulation (IDDES) turbulence model, considers air compressibility, and establishes a three-dimensional coupled train-subgrade-wind dynamics model. The aerodynamic load (AL) variation rules of trains and discrepancies in the flow field mechanisms when HSTs transit various types of subgrade-cutting transition sections [half cutting and half flat (HCHF), double side cutting (DC), and half cutting and half embankment (HCHE)] under crosswind conditions are revealed using this model. The results indicate the following. (1) The aerodynamic performance deteriorates when trains transit three subgrade-cutting transition sections under crosswinds. (2) As trains enter the transition section from a flat approach, the head car’s AL power spectrum density (PSD) is the largest when operating in the DC case. (3) After the train drives into the subsequent operating scenario, the average of the AL in the DC case is the lowest. (4) In the DC case, a slope of 1:0.75 should be taken as the basis for the design of the corresponding cutting parameters. (5) After the train enters the cutting, the winding flow speed and number of vortex structures surrounding the trains increase significantly.

Published in Alexandria Engineering Journal

ISSN: 1110-0168 (Print); 2090-2670 (Online)
Publisher: Elsevier
Country of publisher: Egypt
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/alexandria-engineering-journal/

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